Revelation 17:9

Here is the mind that hath wisdom. The seven heads are seven hills on which the woman sitteth,

Revelation 13:18

Here is the wisdom. Let him that hath an understanding count the number of the wild beast: for it is the number of a man: and his number is six hundred sixty six.

Revelation 17:3

And he carried me away in the spirit into a wilderness, and I saw a woman sitting upon a scarlet wild beast, full of names of blasphemy, having seven heads and ten horns.

Matthew 13:11

He answered and said to them, Because to you it is given to know the mysteries of the kingdom of heaven; but to them it is not given.

Matthew 24:15

When therefore ye see the abomination of desolation spoken of by Daniel the prophet, standing in the holy place (he that readeth, let him understand;) Then let them who are in Judea flee to the mountains:

Revelation 13:1

And I stood on the sand of the sea, and saw a wild beast, coming up out of the sea, having seven heads and ten horns, and upon his horns ten diadems, and upon his heads a name of blasphemy.

Revelation 17:7

And the angel said to me, Wherefore didst thou wonder? I will tell thee the mystery of the woman, and of the wild beast that carrieth her, which hath the seven heads and the ten horns.

Revelation 17:18

And the woman whom thou sawest is the great city, which reigneth over the kings of the earth.

Treasury of Scripture Knowledge

Summary

And here is the mind which hath wisdom. The seven heads are seven mountains, on which the woman sitteth.

Bible References

Here

Revelation 13:18
Here is the wisdom. Let him that hath an understanding count the number of the wild beast: for it is the number of a man: and his number is six hundred sixty six.
Matthew 13:11
He answered and said to them, Because to you it is given to know the mysteries of the kingdom of heaven; but to them it is not given.
Matthew 24:15
When therefore ye see the abomination of desolation spoken of by Daniel the prophet, standing in the holy place (he that readeth, let him understand;) Then let them who are in Judea flee to the mountains:

The seven

Revelation 17:3
And he carried me away in the spirit into a wilderness, and I saw a woman sitting upon a scarlet wild beast, full of names of blasphemy, having seven heads and ten horns.
Revelation 13:1
And I stood on the sand of the sea, and saw a wild beast, coming up out of the sea, having seven heads and ten horns, and upon his horns ten diadems, and upon his heads a name of blasphemy.